SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '700078a7e0d9460d7f3e9d62164e53b2b1313b4c675f8b9e08a399fdd1b97512' 
  AND token = 'zni0pfLQDEum3Y0xrsihDmEUNUVKiCVX/pBwm0QHHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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