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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9d76ac71df574f9ee852a05902beb435bddb20393a864300bccc6bb954de788' 
  AND token = 'QhvOxrMyo8+lh32wBPEwAyJ0QjaXhhWUoBeH7ClyXaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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