SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70e94d2e33a1cf92f41de988b04a5b82ffff0dc6fc92cf023dd6477b9c1f990a' 
  AND token = 'vEsMqh1vBb2qpNRgdDpPOTELGXMj6ZSv7HNjYkHfhQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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