SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5832850a581ca33223a962d09030924109f0c64b74917a7d60e5587f6749458a' 
  AND token = 'zLimszYKmPuZCXyAe+xNBUZrAiBX0BXMMxYw29YdGtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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