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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39cfdb730437bea8daad327fe3c3ba9379e051a1d3781ccd58981c65e1681d22' 
  AND token = '9YXvVViWDHO85t24ZMyb7nl47uKAHGfvRCtCE3+na44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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