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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec35dc01a01960e975a3b9a5a41d01d6382caf50d5c1e6795105eba050a20ec7' 
  AND token = '/01vU56utAXsfM1W3EDyo4uPGhg/qRagynN8lEwEiz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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