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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1730ad34feca84ea1171e2a5f1cd6dda5e7099282588e846befe57df9b948c6b' 
  AND token = 'q319irt6Wl9W81F7zmyPoW9hupHBxtg3wv1s41hQavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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