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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb8bf6b5ce3b4d386b97e2c01d32b6cc63e108457c3d8736876f14366b6acb6c' 
  AND token = 'ZbaVua+OrFaCweQLgrgVE+UGHS+u5YfuoHOrxi3v7yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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