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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e96da9ef2e2929921ac869bcef3b60faa32183c774a559267f89f5ea7eb737f' 
  AND token = '1YDkjGZ8ESzfXVbAg2qhWECyd5PAA5X2qP6rngAwZ9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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