SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25f2bbc0563edb4ef6a193e0b5b4dc5a47e39e1797d0e174a4441f3ec898e6fb' 
  AND token = 'zgYnJpPeIM4ORMP+UVhvG9Pto6hqocpXkyRXQYXPCgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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