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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9bb7aa5227c465c812e5d763ca5fc2760841fa89507787b5cd717894a2e1ed3' 
  AND token = 'HxRuk8IYpqOSdEZOFZtJFDl410yH1CAk2IO4riERb5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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