SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83ba52c35ef3eac02d1c392b9e4e9aa5e5c3df7e714b296e6a71860588813668' 
  AND token = '1DHKhvU1aebgSMY9zHlYyTq8wYtgQ/HiR/bXu2V/PGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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