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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e53d6715c49216e29c3ae278c31e570552eb45f4241f60f37dbee21419c210b' 
  AND token = 'n7sS4pczEfB6stydMnP/a+/dnhUriZkoKHYX9YvdS9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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