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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e02c6624fb44d8cd30385c8a32ba151a6dd51a696aee6d439dcb7772837c46ef' 
  AND token = 'rXccs59FBQ4Rjn7evdQCJ20ykNFsfsxnpn4sI2yPg/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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