SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a83a81b506135c77a981101ac9036ba079037edf8788e843c3fb620b92059bd' 
  AND token = 'Qu7hIjYSjKl7JcUnjiyqll36weECVXqPI5wiEBpJJXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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