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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00c78787e6927e39ba17052622f9edfc4f86af8475ffde0643a64a6f7140e9ef' 
  AND token = '4cAhcxSKxIuSM/e7e2JBXIYmn3O1PF/9Bm3n0ics99E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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