SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98fa9abe15b4b957edc49a295911c3f5397302ea57000853b944da6d10ff9fae' 
  AND token = 'mMvJgTy8IJY1aw3Fg2CV+fq5EKv3xJpuoOwG45j4+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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