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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c98d03ffa6fffa6458f6bca7c99222c3e485bbc2f1a4b6a6db3b5df0e8ea9e37' 
  AND token = 'obrMb4YOwZmYOSmkrK2tBU7CuCn+0oClB3cuIQLa8S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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