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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c7e55389a98fe81607ab0639569fb93a5afa569c5767927f08ab33e095af23c' 
  AND token = 'nujN9E9ZjcctCkfn/6QgjlQAqDZuD9AOFotE5Af8f2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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