SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3c1a5942e149dbf6c2712a9ab95653d5acdad685683b6ba3e6c1362faf37525' 
  AND token = 'BrMRg8TCdnQOzCZ0KvJ/msw+PysXBORJXlF8rH+NqwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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