SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '543381fad28bd30c542a156579c6eb6b0e5312a3e3bbc5c548d787c26106f6f1' 
  AND token = 'mfKH5ADwqvJLKC76ijYVS6qsAd81xLR4xcTY0sSWzxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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