Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3efa05de04fd1b51952dbb9541006dc7cf4569c7c4e5b347dc97f5cf7ea7eb68' 
  AND token = '9xTFbjuEXDT/DbQjU3IDn5J+Eku6YSauHSH+zIDGGiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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