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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddc9bafed7237f6f73db4edaf7a7269ccb2912013c58352b9b5d68512b17ba16' 
  AND token = 'teD93a7el97Vjr5QFJpcU/50fce3m3iudg3UAOM/npw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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