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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1c6994883fe1afb09269d36c3b13c74bdb066dbf0ae97a6f30f625f1cded9fc' 
  AND token = 'xv7CnfOZK/sAEZto7oA7xVnDer+qpDl/mifoqksINWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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