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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8436a1c4da84695a5859236f73652dde6c3fbfc6b2eda2bd01e8d930e18574f0' 
  AND token = 'trU8HERgq0w8Gkn/3FBf4GBqDP6/q13ZHaODlL5lcA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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