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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '902a81292201381696e6af17d7382152477d9727fe265b3229e0511840255626' 
  AND token = 'x9JGajpYTICOdNmlrkj7Vd/7pNL6HYhGsq60k/SPErM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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