SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3f24a2420e3613f7f26b2d488c410c89d2a9a37f5f83f8703703e7524946215' 
  AND token = 'UBqL8X+ftytJ4KuWVv5/1om70BkMnOmcvDgxQD/WWxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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