SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb95ae4269cd8f6a420f0e33fc45a87421b37a198aad965627c8946e3ea29405' 
  AND token = 'IX76QyK5VmnsAlfBmqqWnnvCCHojn6CqBz0Hlj77wz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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