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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '803328fbfdd371e59e25a73c8fba8b07a7d8e21f544654ae59a1588afe544370' 
  AND token = 'BeF85hutEdTcLi3wAA3FynpxU23alWZmyY3lz48QhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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