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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a114c4886bc215797399f529586b8c53411d7002e0c3e878f0582f02e1ef5a9e' 
  AND token = '8E96QlW36DNxmpJN1/tJ4IXNG1pfydoWaS9yul0yzMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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