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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc53443e7400ee1581c9ede34a8b4423c454d1cc3e76c2bdca3a31ed4827257' 
  AND token = 'DF8Za3P5x1f65dVF6f5aVzOKmecicH/7gT7glqW2a1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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