Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39945b0a21c6e8c36c239eb35dd79a6653e1baf5a7e1ed439c2f25f90160aaac' 
  AND token = 'g/8TqaLzXiUGxT2TAxaP+6Q/EeCm6AbML/VuUkjHnsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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