SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f6ef292f817ad4ec6739dc56872bbd58d040950eb070a2574d549602d8752ac' 
  AND token = 'bK3qYnhCF6tfjTBoiQmsV30ZD0cujzHIRgBbDiK08bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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