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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a086a1e7cca7224a2605e5c0c069a471223426fecf46f4d9d7f495e30751b5e5' 
  AND token = 'Zk0NCb+fWY3QXnyydPlCmQG57mVHTF1N1J2rtLpnQJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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