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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e4dde2daa19ec8769d813b7f9a77dd952447fc4c6e7d05fbf52969ee169fc9c' 
  AND token = '+69LSmvXwyiDQmBpnkBH5OU76N71SFXDly90vv1XQNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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