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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc8dca712c69480f867395925180ad9f820ad2216b7fc0e25e1bf3d93e9c6c0' 
  AND token = 'mt/nXa2EYf8S6CBA5+8WDfFoGIFt1eJaLr5EkNss2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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