SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bec00c63fec8625a60131b31ed54d006b68cb3185990084dc7206cff0b7e7c7d' 
  AND token = 'gCeYuKL4yfSdRpzobZUKl4SEGUQ/cmo+IZUjq1Fdlxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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