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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e3897a476cd847877f6abbfd22c5fe10f64d7a117d3e59f678e8c66a7c3b35' 
  AND token = 'kLXeWK1LcC4YVGoOvt/qWCMewFZE2ye/o9vPMf2ki18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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