SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e043a419dbdf9f1b4603acd8ef624c30d80a352687328414f94ed1229f068d0f' 
  AND token = '/26OzRwvMwQr+gUVuqvhfSu2p+JBBqnLl6x7KXwUqkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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