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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '289a6dd74cf66f98374bad5be7892b25b3f2870bc3aeca1cdc11533229be9bc7' 
  AND token = 'JXnwzEQdd63JXi7RmqyE6UKR8Ow1NrDCRx4c4xXwMVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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