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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cefe4ced527002270d57d95872b7101d6b6a46554c535e5202eb0772a19de26c' 
  AND token = 'K8vzLai1hxSv9ScCfvLJZtL12toKY4JgrXaL6JVMYtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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