SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17fc09bfa2f9866221c96eb94e0167a56ab7cac58bf1da365b7948f28e5574a7' 
  AND token = 'rLIQKyA91Uvu8pYDV+Lm7SZbMxTVR/HGXccYPhGZolM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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