SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d7710cdee05594afcbc43491b382b3245091188e8281fc8807c29b3ad2b1485' 
  AND token = 'xnv0SuvnYrSx5AZ0g0p+sYnVHqj1EgTsXKMrB+nFl2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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