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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '699d9fdc5dfbb21e0d4232443d38330d7f79b746b3c2d3490c353d96306766c0' 
  AND token = 'IKaOuevdk7Cwi6tZSw0uutWFEzinzn6OFsTRVqhfHOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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