SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c268d2baef417e57428c29b4e92bc0df63a217bd29be4a2b1116f87b9bbb157d' 
  AND token = 'wHwahrGFkqyev45JRJjV50xjops4X03YUQYqGghE6fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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