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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cf39f5e80be32a2eb0b432194ae3391f5c8307054d9e6bad27ebb42fb094d30' 
  AND token = 'AnJ/xvy1TxrB7F6NtZcT0a+E9kfcTtmb0WFekrqrOgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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