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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4b4e6cd4da588d1485db1aac03d71efa25664cf7028fd6914073fc60145232f' 
  AND token = 'WisTpQNWeawgLsdb4y5fnit9hq00m44Vco+eX3uYfn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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