SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6e7d96773e844b12da7fe6da1d1c17f517628417a5e0583e1421b54e6531282' 
  AND token = 'zu2tQGwsxF2q9P/GZB+UwtcoxfAnr9vIwN1Da2kh0hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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