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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65292b593c287aed31f96b28286e898d85af02a8056f42d96ff7c0bdf0108a86' 
  AND token = 'f4Ld4xGMGUXqTUb9Njl1rZRuZfj59M24rsQIoCqsTKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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