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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78b00e06366060d7ffc6229269c6a43ccfb4413e9efcbd48e9d5594b1418ca37' 
  AND token = 'ifg0M1+KLCdkQikdeoxlZD3ObYRM5S8DT6qER3jI6nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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