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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e1e3d30f3c1e4955a1e76f6b67ec16a0af150b75ef78cd79c4b1da666d78f3c' 
  AND token = 'kFb1ZkziOcDmXHK6JT0cMmC8PYyTdDpZuTBMQZAGA40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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