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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d36da1c10e18740a380c73719ed776887b553f400fb2e4bd034ef1ff6113136' 
  AND token = 'mNIrVaW+ppPwb2X3FsJ31omZjsm/v2Zw0PoUtU5eiwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}