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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6270daaf1d1068cc3caedacba81e672c346052d5e601ead7ceccc03b4f621e32' 
  AND token = 'bLIwJFjMAYPrmUXCpELm+i5DpldwejzHZBa0z0Ig7GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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