SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c54028c4396ddd3f498821231cada53f242a0eab04c15b1be41ef14a360eda68' 
  AND token = 'GanBmYJDvDslLnS+s9Dt0xv7ItUIhBSPZO4rRjrL1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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