SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5853cc6b53549e31eb0b8229e84a2a4c476733f96369311da975ded0d7438a6c' 
  AND token = 'LVcDLZ2Q/KTcDbvsFI0uNGhEl0z6ST8Rte3mnz9EzYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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